It is a fully featured scientific calculator for OS X with support for hexadecimal, octal and binary calculations, as well as an optional RPN mode, parentheses, programmable functions, and an extensive set of unit conversions.

Features include:

Switchable button layouts - choose from many different horizontal and vertical layouts to suit your needs. Includes all the layouts from the iPhone and iPad, as well as Mac-specific ones.

A powerful Notification Center widget on Yosemite - tap the app icon at the side to switch to the main app, mid-calculation.

Calculator themes - pick your look, all the way from minimalist to striking.

An RPN mode with one button access to the stack, and optional multiple-line display.

Editable user conversions, functions, and constants which are synced automatically across multiple devices.

Hexadecimal, octal and binary modes, complete with a variety of bitwise operators.

A simulated paper tape to keep track of your calculations with a "ticker tape" mode under the main display.

Smart searching of conversions, functions, and constants. Just search for "$ to £" for example.

Stylish, consistent user interface.

Support for Retina displays.

Full AppleScript support.

Multiple undo and redo.

Modern 64-bit Cocoa application.

Full support for OS X 10.10 Yosemite.

Handoff of in-progress calculations between PCalc on iOS 8 and Yosemite.

"…what’s perhaps most impressive about PCalc is that TLA Systems has managed to squeeze so much functionality into the program without making it unwieldy; rather, it’s positively fun to use…"
Dan Frakes, Macworld, May 2010

"…PCalc is the app for those of us that need pure power when computing on the iPhone…"AppAdvice

"…best calculator for power users…"
Rob Griffiths, Macworld, December 2008

"...think of it as the Lexus or BMW of Mac calculators. PCalc has a large following of dedicated users
because it’s a calculator that does more than the sum of the parts..."
Alexis Kayhill, Mac360, October 2008

"...for me, buying PCalc was a no-brainer. And I didn’t even need a calculator to figure that out..."
Dan Frakes, Macworld, August 2008